Overview
The PCA9548APW,118 is an 8-channel I2C-bus switch produced by NXP USA Inc. This device is designed to manage multiple I2C-bus channels, making it ideal for applications where multiple devices share the same I2C address or where voltage-level translation between different buses is necessary. The PCA9548A is controlled via the I2C bus and features bidirectional translating switches, allowing for flexible and efficient communication between various components in a system.
Key Specifications
| Parameter | Value |
|---|---|
| Manufacturer | NXP USA Inc. |
| Part Number | PCA9548APW,118 |
| Description | 8-channel I2C-bus switch with reset |
| Package | 24-TSSOP (0.173, 4.40mm Width) |
| Mounting Type | Surface Mount |
| Operating Temperature | -40°C to 85°C |
| Supply Voltage | 2.3V to 5.5V |
| Input Voltage Tolerance | Up to 6V |
| Clock Frequency | 0 Hz to 400 kHz |
| ESD Protection | Exceeds 2000 V HBM, 1000 V CDM |
| Latch-Up Performance | Exceeds 100 mA per JESD78 |
| Number of Channels | 8 |
| Reset Input | Active LOW |
| Thermal Resistance (Junction to Ambient) | 128 °C/W (TSSOP24 package) |
Key Features
- 1-of-8 bidirectional translating switches controlled via the I2C bus
- I2C bus and SMBus compatible
- Active-LOW reset input for recovering from stuck I2C-bus states
- Three hardware address pins allowing up to eight PCA9548A devices on the I2C bus
- Channel selection via I2C bus
- Power-up with all switch channels deselected
- Low RON switches for minimal voltage drop
- Voltage-level translation between 1.8-V, 2.5-V, 3.3-V, and 5-V buses
- No glitch on power-up
- Supports hot insertion
- Low standby current
- ESD protection exceeds 2000 V HBM and 1000 V CDM
Applications
- Servers and data centers to manage multiple I2C devices
- Telecom switching equipment and routers
- Factory automation systems requiring multiple I2C devices
- Products with I2C slave address conflicts, such as multiple identical temperature sensors
Q & A
- What is the primary function of the PCA9548APW,118?
The PCA9548APW,118 is an 8-channel I2C-bus switch that allows for the management and selection of multiple I2C-bus channels, enabling communication between various devices on different voltage levels.
- What is the operating temperature range of the PCA9548APW,118?
The operating temperature range is from -40°C to 85°C.
- What is the supply voltage range for the PCA9548APW,118?
The supply voltage range is from 2.3V to 5.5V.
- Does the PCA9548APW,118 support voltage-level translation?
- How many PCA9548A devices can be used on the same I2C bus?
Up to eight PCA9548A devices can be used on the same I2C bus, thanks to the three hardware address pins.
- What is the purpose of the active-LOW reset input?
The active-LOW reset input allows the device to recover from a situation where one of the downstream I2C-buses is stuck in a LOW state.
- Does the PCA9548APW,118 support hot insertion?
- What is the maximum junction temperature for the PCA9548APW,118?
The maximum junction temperature should not exceed 125°C.
- What kind of ESD protection does the PCA9548APW,118 offer?
The device offers ESD protection that exceeds 2000 V HBM and 1000 V CDM.
- What are some common applications for the PCA9548APW,118?
- What is the clock frequency range supported by the PCA9548APW,118?
